©TCP-tryJAVA

import java.util.*;

class LandAnimal { public void crying() { System.out.println("육지동물"); } }
class Cat extends LandAnimal { public void crying() { System.out.println("냐옹냐옹"); } }
class Dog extends LandAnimal { public void crying() { System.out.println("멍멍"); } }
class Sparrow { public void crying() { System.out.println("짹짹"); } } 

class AnimalList<T> {
	ArrayList<T> al = new ArrayList<T>();
	
	public static void cryingAnimalList(AnimalList<? extends LandAnimal> al) {
		LandAnimal la = al.get(0);
		la.crying();
	}
	
	void add(T animal) { al.add(animal); }
	T get(int index) { return al.get(index); }
	boolean remove(T animal) { return al.remove(animal); }
	int size() { return al.size(); }
}

public class prog {
	public static void main(String[] args) {
		AnimalList<Cat> catList = new AnimalList<Cat>();
		catList.add(new Cat());
		AnimalList<Dog> dogList = new AnimalList<Dog>();
		dogList.add(new Dog());
		
		AnimalList.cryingAnimalList(catList);
		AnimalList.cryingAnimalList(dogList);
	}
}